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Questions  

If E(θ)=cos2θcosθsinθcosθsinθsin2θ and θ and ϕ differ by an odd multiple of π2, then E (θ) E (ϕ) is a 

a
null matrix
b
unit matrix
c
diagonal matrix
d
none of these

detailed solution

Correct option is A

E(θ)=cos2⁡θcos⁡θsin⁡θcos⁡θsin⁡θsin2⁡θ  θ-ϕ=π2⇒θ=π2+ϕ Eϕ=sin2ϕ-cosϕsinϕ-cosϕsinϕcos2ϕ E(θ)E(ϕ)=cos2θcosθsinθcosθsinθsin2θsin2ϕ-cosϕsinϕ-cosϕsinϕcos2ϕ                  =cos2θsin2ϕ-cos2θsin2ϕ-cos2θsin2ϕ+cos2θsin2ϕcos2θsin2ϕ-cos2θsin2ϕ-cos2θsin2ϕ+cos2θsin2ϕ                   =0000

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